package com.moli.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.moli.constans.SystemConstants;
import com.moli.domain.ResponseResult;
import com.moli.domain.dto.AddArticleDto;
import com.moli.domain.dto.ArticleDto;
import com.moli.domain.entity.Article;
import com.moli.domain.entity.ArticleTag;
import com.moli.domain.entity.Category;
import com.moli.domain.vo.*;
import com.moli.mapper.ArticleMapper;
import com.moli.service.ArticleService;
import com.moli.service.ArticleTagService;
import com.moli.service.CategoryService;
import com.moli.utils.BeanCopyUtils;
import com.moli.utils.RedisCache;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;

import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;

/**
 * @Author： xiaolu
 * @Date： 2023-06-03 23:49
 * @Description： 文章实现层
 */

@Service
public class ArticleServiceImpl extends ServiceImpl<ArticleMapper, Article> implements ArticleService {

	@Autowired
	private CategoryService categoryService;

	@Autowired
	private RedisCache redisCache;

	@Autowired
	private ArticleTagService articleTagService;

	@Override
	public ResponseResult hotArticleList() {
		//查询热门文章 封装成ResponseResult返回
		LambdaQueryWrapper<Article> queryWrapper = new LambdaQueryWrapper<>();
		//必须是正式文章
		queryWrapper.eq(Article::getStatus, SystemConstants.ARTICLE_STATUS_NORMAL);
		//按照浏览量进行排序
		queryWrapper.orderByDesc(Article::getViewCount);
		//最多只查询10条
		Page<Article> page = new Page(1,10);
		page(page,queryWrapper);

		List<Article> articles = page.getRecords();
		//bean拷贝
//        List<HotArticleVo> articleVos = new ArrayList<>();
//        for (Article article : articles) {
//            HotArticleVo vo = new HotArticleVo();
//            BeanUtils.copyProperties(article,vo);
//            articleVos.add(vo);
//        }
		List<HotArticleVo> vs = BeanCopyUtils.copyBeanList(articles, HotArticleVo.class);
		return ResponseResult.okResult(vs);
	}

	@Override
	public ResponseResult articleList(Integer pageNum, Integer pageSize, Long categoryId) {
		//查询条件
		LambdaQueryWrapper<Article> lambdaQueryWrapper = new LambdaQueryWrapper<>();
		// 如果 有categoryId 就要 查询时要和传入的相同
		lambdaQueryWrapper.eq(Objects.nonNull(categoryId)&&categoryId>0 ,Article::getCategoryId,categoryId);
		// 状态是正式发布的
		lambdaQueryWrapper.eq(Article::getStatus,SystemConstants.ARTICLE_STATUS_NORMAL);
		// 对isTop进行降序
		lambdaQueryWrapper.orderByDesc(Article::getIsTop);

		//分页查询
		Page<Article> page = new Page<>(pageNum,pageSize);
		page(page,lambdaQueryWrapper);

		List<Article> articles = page.getRecords();
		//查询categoryName
		articles.stream()
				.map(article -> article.setCategoryName(categoryService.getById(article.getCategoryId()).getName()))
				.collect(Collectors.toList());
		//articleId去查询articleName进行设置
//        for (Article article : articles) {
//            Category category = categoryService.getById(article.getCategoryId());
//            article.setCategoryName(category.getName());
//        }


		//封装查询结果
		List<ArticleListVo> articleListVos = BeanCopyUtils.copyBeanList(page.getRecords(), ArticleListVo.class);




		PageVo pageVo = new PageVo(articleListVos,page.getTotal());
		return ResponseResult.okResult(pageVo);
	}

	@Override
	public ResponseResult getArticleDetail(Long id) {
		//根据id查询文章
		Article article = getById(id);
		//从redis中获取viewCount
		Integer viewCount = redisCache.getCacheMapValue("article:viewCount", id.toString());
		article.setViewCount(viewCount.longValue());
		//转换成VO
		ArticleDetailVo articleDetailVo = BeanCopyUtils.copyBean(article, ArticleDetailVo.class);
		//根据分类id查询分类名
		Long categoryId = articleDetailVo.getCategoryId();
		Category category = categoryService.getById(categoryId);
		if(category!=null){
			articleDetailVo.setCategoryName(category.getName());
		}
		//封装响应返回
		return ResponseResult.okResult(articleDetailVo);
	}

	@Override
	public ResponseResult updateViewCount(Long id) {
		//更新redis中对应 id的浏览量
		redisCache.incrementCacheMapValue("article:viewCount",id.toString(),1);
		return ResponseResult.okResult();
	}

	@Override
	@Transactional
	public ResponseResult add(AddArticleDto articleDto) {
		//添加 博客
		Article article = BeanCopyUtils.copyBean(articleDto, Article.class);
		save(article);


		List<ArticleTag> articleTags = articleDto.getTags().stream()
				.map(tagId -> new ArticleTag(article.getId(), tagId))
				.collect(Collectors.toList());

		//添加 博客和标签的关联
		articleTagService.saveBatch(articleTags);
		return ResponseResult.okResult();
	}

	@Override
	public PageVo selectArticlePage(Article article, Integer pageNum, Integer pageSize) {
		LambdaQueryWrapper<Article> queryWrapper = new LambdaQueryWrapper();

		queryWrapper.like(StringUtils.hasText(article.getTitle()),Article::getTitle, article.getTitle());
		queryWrapper.like(StringUtils.hasText(article.getSummary()),Article::getSummary, article.getSummary());

		Page<Article> page = new Page<>();
		page.setCurrent(pageNum);
		page.setSize(pageSize);
		page(page,queryWrapper);

		//转换成VO
		List<Article> articles = page.getRecords();

		//这里偷懒没写VO的转换 应该转换完在设置到最后的pageVo中

		PageVo pageVo = new PageVo();
		pageVo.setTotal(page.getTotal());
		pageVo.setRows(articles);
		return pageVo;
	}

	@Override
	public ArticleVo getInfo(Long id) {
		Article article = getById(id);
		//获取关联标签
		LambdaQueryWrapper<ArticleTag> articleTagLambdaQueryWrapper = new LambdaQueryWrapper<>();
		articleTagLambdaQueryWrapper.eq(ArticleTag::getArticleId,article.getId());
		List<ArticleTag> articleTags = articleTagService.list(articleTagLambdaQueryWrapper);
		List<Long> tags = articleTags.stream().map(articleTag -> articleTag.getTagId()).collect(Collectors.toList());

		ArticleVo articleVo = BeanCopyUtils.copyBean(article,ArticleVo.class);
		articleVo.setTags(tags);
		return articleVo;
	}

	@Override
	public void edit(ArticleDto articleDto) {
		Article article = BeanCopyUtils.copyBean(articleDto, Article.class);
		//更新博客信息
		updateById(article);
		//删除原有的 标签和博客的关联
		LambdaQueryWrapper<ArticleTag> articleTagLambdaQueryWrapper = new LambdaQueryWrapper<>();
		articleTagLambdaQueryWrapper.eq(ArticleTag::getArticleId,article.getId());
		articleTagService.remove(articleTagLambdaQueryWrapper);
		//添加新的博客和标签的关联信息
		List<ArticleTag> articleTags = articleDto.getTags().stream()
				.map(tagId -> new ArticleTag(articleDto.getId(), tagId))
				.collect(Collectors.toList());
		articleTagService.saveBatch(articleTags);

	}
}
